Draft-regulator.



J. MILTON.

DRAFT REGULATOR.

APPLICATION rum) NOV. 23. 1912 1,072,023. Patented Sept. 2, 1913.

2 SHEETS-SHEET 1.

WITNESSES INIZNY'OR J/uz/ ii /515010 1 Home}? J. MILTON.

DRAFT REGULATOR.

APPLIOATION IILEI) NOV. 23, 1912.

Patented Sept. 2, 1913.

2 SHEETS-SHEET 2.

- \EEEHEM I I mlililm EEEEQEESW all/mm a m N N WITNESSES I INVENTOR1/0/2122 Maia/0- JOHN MILTON, OF WASHINGTON, DISTRICT OF COLUMBIA.

DRAFT-REGULATOR.

Specification of Letters Patent.

Patented Sept. 2, 1913.

Application filed November 23, 1912. Serial No. 733,114.

To all whom it may concern:

Be it known that 1, JOHN MILToN, a citizen of the United States,residing at WVashington, District of Columbia, have invented certain newand useful Improvements in Draft-Regulators, of which the following is aspecification.

My invention relates to certain new and useful improvements in draftregulators, particularly adapted for use upon locomotive and otherboilers having an extension front into which the cylinders exhaust.

The object of my invention is to produce a simple and light constructionwhich shall be cheap to manufacture, light and highly efficient incontrolling the tendencies of heavy exhausts, which tend to lift thefire in grate bars, producing holes therein and also drawing the firethrough the tubes into the front and preventing proper combustion.

With these and other objects in view my invention consists in certainconstructions, combinations and arrangement of parts, the preferred formof which will be first described in connection with the accompanyingdrawing, and then the invention particularly pointed out in the appendedclaims.

Referring to the drawings wherein the same part is designated by thesame reference numeral wherever it occurs, Figure 1 is a front elevationof a portion of the front end of the extension front of a locomotiveequipped with my invention; Fig. 2 is a section taken on line 2, 2 ofFig. 1, looking in the direction of the arrow; Fig. 3 is a centralvertical section through Fig. 1, showing the valve closed; Fig. 4: is asimilar view showing the valve opened by the force of the exhaust, andFig. 5 is a view similar to Fig. 4, showing however the valve whenopened automatically by air pressure in the valve controlling cylinder.1

10 designates the extension front or smoke box having the usual openingtherein which, however, instead of being closed by a cover, has seatedtherein a plate 11 secured in position by bolts 12. This plate isprovided with an opening 13 therein which, preferably, and as shown, isof a generally semicircular form, and on the interior is provided withan inwardly extending beveled flange 14: and a valve seat 15. At oneside of the opening, preferably the central portion of the bottom, Iprovide an inwardly projecting semi-circular boss 16 formed on theexterior with a semi-circular depression 1 7, between the ends of whichextend the pivot pin 18, on which is mounted a sleeve 19 carrying acurved arm 20, terminating in a portion 21, to the inner face of whichis secured the semi-circular plate 22 that forms the valve, theperiphery of which is adapted to seat against the valve seat 15 andclose the opening 13 against the passage. of air into the smoke box. Itis essential that this valve remain closed until the exhaust is of apredetermined strength and that it then open increasing amounts as thestrength of the exhaust increases beyond a predetermined amount. It isalso essential that this valve be open wherever the fire box door isopen, in order to prevent cold air being drawn in through the door inlarge amounts by the force of the exhaust. In order to thus control theoperation of the valve I provide mechanism which will now be described.

Mounted on the plate 11, preferably between the pivot 18 and the openingin said plate, is a bracket 23 carrying a cylinder 24-, closed at itslower end by a head 25, through which extends a pipe 26 adapted to becon nected to a suitable source of air supply controlled by any suitablevalve mechanism operated by the door, one form of said door operatedvalve mechanism being shown in my Patent No. 1,031,458, patented July 2,1912, it being understood however that any other form of door operatedmechanism may be substituted for that shown in said patent, if desired.Mounted in the cylinder 24 is a piston 27 adapted to he moved away fromthe head 25 when air pressure is introduced through the pipe 26. Theupper end of the cylinder 24 is closed by a cap 28, threaded onto theend of the cylinder 21, and through this cap extends a rod 29, recessedat its lower end to receive the projecting stud 30, carried by thepiston 27, and to guide and retain said piston in true verticalalinement. Mounted on the rod 29. between the head 28 and a collar 31secured to the lower end of the rod 29, is a coil spring 32.

From the foregoing description it will be seen that when sufficient airpressure is admitted to the cylinder 24, below the piston 27, the pistonwill be forced upwardly carrying the rod 29 upward, and also that a pullon the upper end of the rod 29 of sufficient strengthto overcome thetension of the spring 32, will cause it to move upwardlywitho'ut,however, moving the piston. The force necessary to move the rod 29 canbe adjusted by adjusting the head 28 on the cylinder 24, to increase ordecrease the tension of the spring 32. Mounted on the upper end of therod 29 is across bar 33, on the outer ends of which are mounted thelinks 3 1 connected at their lower ends to arms 35 formed on the sleeve19. When, therefore, the piston 27 moves upwardly under air pressureadmitted to the cylinder,

the valve will be opened through the medium of the cross head 33, thelinks 34, the arms 35, the sleeve 19 and the arm 20, and that theopening of the valve 22 by the force of the draft will, through the sameconnection, move the rod 29 and compress the possible in the details ofconstruction and arrangement of parts without departing from the splrltof my invention, and I therefore do not intend to limit myself to thespecific form shown and described.

Having thus described my invention what I claim as new and desire tosecure by Letters Patent is:

1. A steam boiler furnace having a smoke-box into which the engineexhausts provided with an opening, a plate provided with an opening andseated in the opening in the smoke-box and having a valve seatin theperiphery of its opening, a plate valve adapted to seat in thelast-mentioned open ing, an arm extending from the valve, a

pivot for said arm, a relatively short arm extending from said pivot,fluid pressure valve-opening means connected to said last mentioned armsaid means being provided with a spring for normally holding the valvein closed position, all of said valveoperating parts being located onthe exte rior of the smoke-box.

2. A steam-boiler furnace having a smoke-box into which the engineexhausts, said smoke-box being provided with an opening substantiallyflush with the wall of the smoke-box, a fiat plate valve adapted to seatin the opening and close the same, the smoke-box being provided with adepression adjacent the opening therein, a

pivot-pin mounted in said depression, an arm extending from the valve onthe exte- V rior side thereof and journaled on the pivot pin, and springactuated means also located on the exterior of the smoke-box connectedto said arm, and tending to hold said valve closed.

3. A steam-boiler furnace having a smoke-box into which the engineexhausts, said smoke-box being provided with an opening, a plate alsoprovided with an opening seated in said first-mentioned opening, a valveseat formed in the periphcry of the opening in the plate, a fiat platevalve adapted to seat in the last-mentioned opening and close the same,an arm extending from the valve, a sleeve carried by said arm, arelatively short arm extending from said sleeve, a cross head, a pistonmovably connected to said cross head, a cylinder in which the piston ismounted, a spring opposing the movement of said cross head in onedirection, and a pair of links connecting said cross head with the armon the sleeve, all of the operating parts of said valve being located onthe exterior of the smokebox, substantially as described.

In testimony whereof I my signature in presence of two wltnesses.

JOHN MILTON.

Witnesses F. L. BROWNE, JOHN L. FLETCHER.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents,

Washington, D. e.

